Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hieu van » hieu va, thien van, hieu ve
hanh tai » thanh tai, hang tai, han tai
duc manh » suc manh, duc anh, duc minh
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
ca viet » va viet, co viet, hoa viet
tai ca » tai cac, tai cao, tai cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty nang) OR (ty hang)) x hoi. ((hieu van) or (lieu va)) cham duc manh hanh tai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty hang)) x hoi. ((hieu van) OR (lieu va)) cham duc manh hanh tai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ty hang)) x hoi. ((hieu van) or (lieu va)) cham duc manh hanh tai ca viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) OR (ty hang)) x hoi. ((hieu van) or (lieu va)) cham duc manh hanh tai ca viet*.